Abstract

DIANA NAVARRO, Rodrigo, RIBEIRO FILHO, SHIGUEKI YASUI, George et al. Effect of hormone 17 the metil - testosterone on the index somatic of Rana catesbeiana. Zootecnia Trop., Aug. 2005, vol.23, no.3, p.319-325. ISSN 0798-7269.

The aim of this article was to evaluate the effects of 17-a -methyl-testosterone on some morphometric indexes in bullfrog (Rana catesbeiana). For that purpose, 120 animals with an initial weigth of 42.052 ± 0.528 g were distributed in four 1,54m² confinements, and fed "ad libitum" with rations containing 44% of crude protein and incorporated with different concentration of the androgen: 0, 20, 40, and 60 mg/kg, respectively. The hepato-somatic index was calculated using the relation HSI = Wf/WT, where Wf was liver weight and Wt was total weight, and the lipo-somatic index was calculated by the expression LSI = WL/Wt, where Wl was visceral fat. It was observed that the hormone did not have an effect in the hepatossomátic and lipossomátic indexes.

Keywords: Bullfrog; hormones; morphometric index; frog culture; performance.